diff --git a/ruma-common/src/thirdparty.rs b/ruma-common/src/thirdparty.rs
index 7e30d5e5..a4fc4e91 100644
--- a/ruma-common/src/thirdparty.rs
+++ b/ruma-common/src/thirdparty.rs
@@ -192,7 +192,7 @@ pub enum Medium {
     Email,
 
     /// Phone number identifier
-    MSISDN,
+    Msisdn,
 
     #[doc(hidden)]
     _Custom(String),